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Updated: Jan 22, 2026

Development and Validation of an Ultrasensitive Single Molecule Array Digital Enzyme-linked Immunosorbent Assay for Human Interferon-α
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Enzyme-Activatable Interferon-Poly(α-amino acid) Conjugates for Tumor Microenvironment Potentiation

Hao Wang, Yingqin Hou, Yali Hu

  • 1CAS Center for Excellence in Nanoscience, School of Life Sciences and Medical Center , University of Science and Technology of China , Hefei , Anhui 230027 , China.

Biomacromolecules
|July 17, 2019
PubMed

Insights

This study introduces enzyme-activatable protein-polypeptide conjugates that release their polymer payload, enhancing protein bioactivity and tumor penetration for improved solid tumor treatment.

Area of Science:

  • Bioconjugation Chemistry
  • Drug Delivery Systems
  • Oncology Therapeutics

Background:

  • Protein-polymer conjugation improves pharmacokinetics but often reduces bioactivity and tumor penetration.
  • Current protein-polymer conjugates face limitations for solid tumor treatment due to irreversible polymer attachment.
  • Overcoming these limitations is crucial for developing effective protein-based cancer therapies.

Purpose of the Study:

  • To develop a novel enzyme-activatable and size-shrinkable protein-polypeptide conjugate for enhanced solid tumor therapy.
  • To investigate the release mechanism and therapeutic potential of matrix metalloproteinase (MMP)-responsive conjugates.
  • To evaluate the in vitro and in vivo efficacy of these conjugates in ovarian cancer models.

Main Methods:

  • Synthesized a site-specific MMP-responsive conjugate (PEP20-M-IFN) by linking interferon (IFN) to a polypeptide P(EG3Glu)20 via an MMP-cleavable peptide.
  • Assessed in vitro bioactivity and in vivo tumor penetration and retention of PEP20-M-IFN compared to a non-responsive analogue (PEP20-IFN).
  • Evaluated the antitumor efficacy of PEP20-M-IFN in mouse models of ovarian cancer (OVCAR3 and SKOV3).

Main Results:

  • PEP20-M-IFN demonstrated higher in vitro bioactivity and improved tumor retention compared to PEP20-IFN.
  • The conjugate showed deeper tumor penetration in a MMP2-dependent manner.
  • Systemic administration of PEP20-M-IFN exhibited significant antitumor efficacy in ovarian cancer models.

Conclusions:

  • The releasable PEPylation strategy effectively potentiates protein drugs within the tumor microenvironment (TME).
  • Enzyme-activatable, size-shrinkable conjugates offer a promising approach to overcome limitations of traditional protein-polymer conjugates for solid tumors.
  • This strategy opens new clinical opportunities for treating malignant solid tumors.

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